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Business Combinations, Goodwill and Intangible Assets (Narrative) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended 0 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Oct. 01, 2013
Dec. 31, 2011
Business Acquisition [Line Items]          
Consolidated assets $ 2,237,099us-gaap_Assets $ 2,163,827us-gaap_Assets $ 2,006,300us-gaap_Assets    
Consolidated equity 228,824us-gaap_StockholdersEquity 200,097us-gaap_StockholdersEquity 185,026us-gaap_StockholdersEquity   167,610us-gaap_StockholdersEquity
Goodwill 20,536us-gaap_Goodwill 20,536us-gaap_Goodwill 18,865us-gaap_Goodwill   18,865us-gaap_Goodwill
Intangible Amortization 1,254us-gaap_AmortizationOfAcquisitionCosts 1,416us-gaap_AmortizationOfAcquisitionCosts 1,655us-gaap_AmortizationOfAcquisitionCosts    
United Commerce Bancorp          
Business Acquisition [Line Items]          
Consolidated assets       119,700us-gaap_Assets
/ us-gaap_BusinessAcquisitionAxis
= gabc_UnitedCommerceBancorpMember
 
Consolidated equity       13,700us-gaap_StockholdersEquity
/ us-gaap_BusinessAcquisitionAxis
= gabc_UnitedCommerceBancorpMember
 
Direct acquisition costs       251us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts
/ us-gaap_BusinessAcquisitionAxis
= gabc_UnitedCommerceBancorpMember
 
Goodwill       1,671us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= gabc_UnitedCommerceBancorpMember
 
Intangible assets acquired       2,052us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= gabc_UnitedCommerceBancorpMember
 
Amortization Period       8 years  
Shares issued in business combination       503,000us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued
/ us-gaap_BusinessAcquisitionAxis
= gabc_UnitedCommerceBancorpMember
 
Equity issued or issuable in business combination, ratio       0.5456gabc_BusinessAcquisitionEquityInterestIssuedOrIssuableRatio
/ us-gaap_BusinessAcquisitionAxis
= gabc_UnitedCommerceBancorpMember
 
Outstanding common stock owned before merger       44,100gabc_BusinessCombinationStepAcquisitionEquityInterestInAcquireeShares
/ us-gaap_BusinessAcquisitionAxis
= gabc_UnitedCommerceBancorpMember
 
Outstanding common stock owned before merger, percentage       4.60%us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireePercentage
/ us-gaap_BusinessAcquisitionAxis
= gabc_UnitedCommerceBancorpMember
 
Share Price       $ 1.51us-gaap_SharePrice
/ us-gaap_BusinessAcquisitionAxis
= gabc_UnitedCommerceBancorpMember
 
Cash Consideration       1,391us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= gabc_UnitedCommerceBancorpMember
 
Cash paid for United Commerce options       643us-gaap_OtherPaymentsToAcquireBusinesses
/ us-gaap_BusinessAcquisitionAxis
= gabc_UnitedCommerceBancorpMember
 
Core Banking          
Business Acquisition [Line Items]          
Goodwill 19,204us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= gabc_CoreBankingMember
19,204us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= gabc_CoreBankingMember
17,533us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= gabc_CoreBankingMember
   
Insurance          
Business Acquisition [Line Items]          
Consolidated assets 6,429us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= gabc_InsuranceMember
5,636us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= gabc_InsuranceMember
8,333us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= gabc_InsuranceMember
   
Goodwill $ 1,332us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= gabc_InsuranceMember
$ 1,332us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= gabc_InsuranceMember
$ 1,332us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= gabc_InsuranceMember